The video clip is of a group of foreigners dancing to Big Bang "Fantastic Baby."

This flash mob had taken place at a Japan Expo. What both surprised and angered people is that this Korean song was played with Japanese lyrics.

Both Korean and Japanese fans expressed their thoughts on this matter.

Korean internet users wrote "Why are they singing a Korean song in Japanese?," "Do they think Big Bang is Japanese?," and "What gets me angry that it was done next to a Japanese Flag."

The Japanese counterparts commented "Why are they playing a Korean song at a Japan Expo? They should be playing Japanese music," "Maybe they thought it was a Japanese song because the lyrics were in Japanese."